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https://www.readbyqxmd.com/read/28334890/application-of-ultrasound-assisted-surfactant-enhanced-emulsification-microextraction-based-on-solidi%C3%AF-cation-of-floating-organic-droplets-and-high-performance-liquid-chromatography-for-preconcentration-and-determination-of-alprazolam-and-chlordiazepoxide-in
#1
Nasser Goudarzi, Monavar Amirnavaee, Mansour Arab Chamjangali, Sahar Farsimadan
An improved microextraction method is proposed on the basis of ultrasound-assisted surfactant-enhanced emulsification and solidification of a floating organic droplet procedure combined with high performance liquid chromatography for the preconcentration and quantification of alprazolam (ALP) and chlordiazepoxide (CHL) present in a number of human serum samples. Several parameters affecting the extraction efficiency were investigated by the Plackett -Burman factorial design as the screening design. Then the response surface methodology based on the Box-Behnken design was used to optimize the effective parameters in the proposed procedure...
March 3, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28330255/ascorbyl-palmitate-synthesis-in-an-organic-solvent-system-using-a-celite-immobilized-commercial-lipase-lipolase-100l
#2
Shivika Sharma, Kriti Kanwar, Shamsher S Kanwar
Ascorbyl palmitate was synthesized using a Celite-immobilized commercial lipase (Lipolase 100L) in dimethylsulfoxide (DMSO) as an organic solvent system. Lipase immobilized by surface adsorption onto Celite 545 matrix and subsequently exposed to 1 % glutaraldehyde showed 75 % binding of protein. The Celite-bound lipase was optimally active at 75 °C and pH 8.5 under shaking and showed maximum hydrolytic activity toward p-NPP as a substrate. The bound lipase was found to be stimulated only in the presence of Al(3+) and EDTA...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330122/production-purification-and-characterization-of-a-thermotolerant-alkaline-serine-protease-from-a-novel-species-bacillus-caseinilyticus
#3
Thirumala Mothe, Vishnuvardhan Reddy Sultanpuram
Alkaline proteases are important enzymes in many industrial applications, especially as additives in laundry detergent industry. Though there are a number of Bacillus species which are reported to be producing proteases, the efficiency of a protease produced by a novel strain has to be studied in comparison to the others. Hence, in this study, an alkaline serine protease produced by a novel species Bacillus caseinilyticus was purified and characterized for its possible usage in detergent industry. Ammonium sulphate, dialysis and DEAE column chromatographic methods were used for purification of the isolated alkaline protease...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28321059/arterial-carboxyhemoglobin-measurement-is-useful-for-evaluating-pulmonary-inflammation-in-subjects-with-interstitial-lung-disease
#4
Yu Hara, Masaharu Shinkai, Soichiro Kanoh, Yuji Fujikura, Bruce K Rubin, Akihiko Kawana, Takeshi Kaneko
Objective The arterial concentration of carboxyhemoglobin (CO-Hb) in subjects with inflammatory pulmonary disease is higher than that in healthy individuals. We retrospectively analyzed the relationship between the CO-Hb concentration and established markers of disease severity in subjects with interstitial lung disease (ILD). Methods The CO-Hb concentration was measured in subjects with newly diagnosed or untreated ILD and the relationships between the CO-Hb concentration and the serum biomarker levels, lung function, high-resolution CT (HRCT) findings, and the uptake in gallium-67 ((67)Ga) scintigraphy were evaluated...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28318025/maternal-chronic-hypoxia-increases-expression-of-genes-regulating-lung-liquid-movement-and-surfactant-maturation-in-male-fetuses-in-late-gestation
#5
Erin V McGillick, Sandra Orgeig, Beth J Allison, Kirsty L Brain, Youguo Niu, Nozomi Itani, Katie L Skeffington, Andrew D Kane, Emilio A Herrera, Dino A Giussani, Janna L Morrison
Chronic fetal hypoxaemia is a common pregnancy complication that may arise from maternal, placental and/or fetal factors. Respiratory outcome of the infant at birth likely depends on the duration, timing and severity of the hypoxaemic insult. We have isolated the effect of maternal chronic hypoxia (MCH) for a month in late gestation on fetal lung development. Pregnant ewes were exposed to normoxia (21% O2 ) or hypoxia (10% O2 ) from 105-138 d gestation (term ∼145 d). At 138 d, gene expression in fetal lung tissue was determined by qRT-PCR...
March 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28315692/role-of-epithelial-mesenchymal-transition-emt-and-fibroblast-function-in-cerium-oxide-nanoparticles-induced-lung-fibrosis
#6
Jane Ma, Bridget Bishoff, R R Mercer, Mark Barger, Diane Schwegler-Berry, Vincent Castranova
The emission of cerium oxide nanoparticles (CeO2) from diesel engines, using cerium compounds as a catalyst to lower the diesel exhaust particles, is a health concern. We have previously shown that CeO2 induced pulmonary inflammation and lung fibrosis. The objective of the present study was to investigate the modification of fibroblast function and the role of epithelial-mesenchymal transition (EMT) in CeO2-induced fibrosis. Male Sprague-Dawley rats were exposed to CeO2 (0.15 to 7mg/kg) by a single intratracheal instillation and sacrificed at various times post-exposure...
March 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28315219/assessment-of-ige-reactivity-of-%C3%AE-casein-by-western-blotting-after-digestion-with-simulated-gastric-fluid
#7
Sara Benedé, Rosina López-Fandiño, Elena Molina
Cow's milk allergy is defined as an immunologically mediated adverse reaction to cow's milk proteins and it is usually, along with hen's egg allergy, the first food allergy identified in childhood.One of the main aspects to consider when evaluating the allergenic potential of food proteins is the effect of gastric digestion. It is known that allergens are usually able to survive the harsh acidic environment of the stomach, tolerate the presence of surfactants, and resist digestion by pepsin. They might also be digested into high molecular weight peptide fragments, which retain the same, or sometimes increased, IgE-binding...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28302541/trends-on-analytical-characterization-of-polysorbates-and-their-degradation-products-in-biopharmaceutical-formulations
#8
REVIEW
Ariadna Martos, Wendelin Koch, Wim Jiskoot, Klaus Wuchner, Gerhard Winter, Wolfgang Friess, Andrea Hawe
Among many other applications, polysorbates (PS) are used as the most common surfactants in biopharmaceutical products in particular to protect proteins against interfacial stress. Structural heterogeneity, presence of degradants and other impurities, and tendency for degradation are interrelated features found in commercial PS with a direct impact on their functional properties in biopharmaceutical products. These pose a challenge for the analytical characterization of PS at different stages of product development...
March 13, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28295039/deciphering-the-mechanism-of-q145h-sftpc-mutation-unmasks-a-splicing-defect-and-explains-the-severity-of-the-phenotype
#9
Céline Delestrain, Stéphanie Simon, Abdel Aissat, Rachel Medina, Xavier Decrouy, Elodie Nattes, Agathe Tarze, Bruno Costes, Pascale Fanen, Ralph Epaud
Mutations in the gene encoding surfactant protein C (SFTPC) have led to a broad range of phenotypes from neonatal respiratory distress syndrome to adult interstitial lung disease. We previously identified the c.435G>C variant in the SFTPC gene associated with fatal neonatal respiratory distress syndrome in an infant girl. Although this variation is predicted to change glutamine (Q) at position 145 to histidine (H), its position at the last base of exon 4 and the severity of the phenotype suggested that it might also induce a splicing defect...
March 15, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28289744/adsorption-of-the-natural-protein-surfactant-rsn-2-onto-liquid-interfaces
#10
Giovanni B Brandani, Steven J Vance, Marieke Schor, Alan Cooper, Malcolm W Kennedy, Brian O Smith, Cait E MacPhee, David L Cheung
To stabilize foams, droplets and films at liquid interfaces a range of protein biosurfactants have evolved in nature. Compared to synthetic surfactants, these combine surface activity with biocompatibility and low solution aggregation. One recently studied example is Rsn-2, a component of the foam nest of the frog Engystomops pustulosus, which has been predicted to undergo a clamshell-like opening transition at the air-water interface. Using atomistic molecular dynamics simulations and surface tension measurements we study the adsorption of Rsn-2 onto air-water and cyclohexane-water interfaces...
March 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28288512/defect-induced-near-infrared-photoluminescence-of-single-walled-carbon-nanotubes-treated-with-polyunsaturated-fatty-acids
#11
Cheuk Fai Chiu, Wissam A Saidi, Valerian E Kagan, Alexander Star
Single-walled carbon nanotubes (SWCNTs) have been incorporated in many emerging applications in the biomedical field including chemical sensing, biological imaging, drug delivery, and photothermal therapy. To overcome inherent hydrophobicity and improve their biocompatibility, pristine SWCNTs are often coated with surfactants, polymers, DNA, proteins, or lipids. In this paper, we report the effect of polyunsaturated fatty acids (PUFAs) on SWCNT photoluminescence. A decrease in the SWCNT bandgap emission (E11) and a new red-shifted emission (E11(-)) were observed in the presence of PUFAs...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28286130/the-benefits-and-misfortunes-of-sds-in-top-down-proteomics
#12
Carolyn Kachuk, Alan A Doucette
Top-down proteomics (TDP) has great potential for high throughput proteoform characterization. With significant advances in mass spectrometry (MS) instrumentation permitting tandem MS of large intact proteins, a limitation to the widespread adoption of TDP still resides on front-end sample preparation protocols (e.g. fractionation, purification) that are amenable to MS analysis of intact proteins. Chromatographic strategies are improving but pose higher risk of sample loss. Gel-based separations (e.g. GELFrEE) may alleviate this concern but at the expense of requiring sodium dodecyl sulfate (SDS)...
March 8, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28278377/surfactant-modified-ultrafine-gold-nanoparticles-with-magnetic-responsiveness-for-reversible-convergence-and-release-of-biomacromolecules
#13
Lu Xu, Shuli Dong, Jingcheng Hao, Jiwei Cui, Heinz Hoffmann
It is difficult to synthesize magnetic gold nanoparticles (AuNPs) with ultrafine sizes (< 2 nm) based on conventional method via coating AuNPs using magnetic particles, compounds or ions. Here the magnetic cationic surfactants, C16H33N+(CH3)3[CeCl3Br]- (CTACe) and C16H33N+(CH3)3[GdCl3Br]- (CTAGd), are prepared by one-step coordination reaction, i.e., C16H33N+(CH3)3Br- (CTABr) + CeCl3 or GdCl3 → CTACe or CTAGd. A simple strategy to fabricate ultrafine (< 2 nm) magnetic gold nanoparticles (AuNPs) via surface modification with weak oxidizing paramagnetic cationic surfactants, CTACe or CTAGd, is developed...
March 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28277329/sevoflurane-compared-with-isoflurane-minimizes-lung-damage-in-pulmonary-but-not-in-extrapulmonary-acute-respiratory-distress-syndrome-in-rats
#14
Mariana N Araújo, Cíntia L Santos, Cynthia S Samary, Luciana B B Heil, Vinicius C M Cavalcanti, Fernanda F Cruz, Nathane S Felix, Johnatas D Silva, Marcelo M Morales, Paolo Pelosi, Fatima C Fernandes, Nivaldo R Villela, Pedro L Silva, Patricia R M Rocco
BACKGROUND: Volatile anesthetics modulate inflammation in acute respiratory distress syndrome (ARDS). However, it is unclear whether they act differently depending on ARDS etiology. We hypothesized that the in vivo and in vitro effects of sevoflurane and isoflurane on lung damage would not differ in pulmonary (p) and extrapulmonary (exp) ARDS. METHODS: Twenty-four Wistar rats were randomized to undergo general anesthesia (1-2 minutes) with sevoflurane and isoflurane...
March 8, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28277006/cationic-copolymer-augments-membrane-permeabilizing-activity-of-an-amphiphilic-peptide
#15
Wakako Sakamoto, Takuro Ochiai, Naohiko Shimada, Atsushi Maruyama
Membrane disruptive peptides (also called membrane fusogenic peptides) have been employed for cytosolic delivery of macromolecules such as nucleic acids and proteins. We reported previously that the cationic graft copolymer, poly(allylamine)-graft-dextran (PAA-g-Dex), augments membrane disruptive activity of the negatively charged E5 peptide. Strong membrane disruptive activity was observed in the presence of the copolymer at both acidic and neutral pH. In this paper, activities of E5/PAA-g-Dex mixture were further explored...
February 17, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28275485/serum-kl-6-and-surfactant-protein-d-as-monitoring-and-predictive-markers-of-interstitial-lung-disease-in-patients-with-systemic-sclerosis-and-mixed-connective-tissue-disease
#16
Hideaki Yamakawa, Eri Hagiwara, Hideya Kitamura, Yumie Yamanaka, Satoshi Ikeda, Akimasa Sekine, Tomohisa Baba, Koji Okudela, Tae Iwasawa, Tamiko Takemura, Kazuyoshi Kuwano, Takashi Ogura
BACKGROUND: Interstitial lung disease (ILD) is frequent complication of systemic sclerosis (SSc) and mixed connective tissue disease (MCTD). The disease is heterogeneous, and its outcome is unpredictable. Some patients have severe and progressive deterioration of ILD, which is the leading cause of mortality. We aimed to determine whether serum levels of Krebs von den Lungen-6 (KL-6) and surfactant protein-D (SP-D) correlate with SSc/MCTD-associated ILD activity. METHODS: We retrospectively analyzed the medical records of 40 patients with SSc/MCTD-associated ILD: 29 patients with SSc and 11 patients with MCTD...
February 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28271630/sample-clean-up-strategies-for-electrospray-ionization-mass-spectrometry-applications-in-bottom-up-proteomics-trends-from-2012-2016
#17
REVIEW
Ria Marni Tubaon, Paul R Haddad, Joselito P Quirino
Bottom-up proteomics is a mass spectrometric (MS)-based approach for the characterization of peptides obtained from in-solution protein digestion. MS is favoured over other methods for peptide and protein analysis because of its better sensitivity and high throughput. Inorganic ions and surfactants present in the sample or produced during tryptic digestion are detrimental in MS analysis and affect the proteome data, thus sample preparation for removal of these unwanted components has become essential. Here, we review 48 research papers on strategies for removal of salts and surfactants (in particular, sodium dodecyl sulfate, SDS) prior to electrospray ionization (ESI)-MS analysis in bottom-up proteomics from 2012-2016...
March 8, 2017: Proteomics
https://www.readbyqxmd.com/read/28270576/bacillus-subtilis-and-surfactin-inhibit-the-transmissible-gastroenteritis-virus-entering-intestinal-epithelial-cells
#18
Xiaoqing Wang, Weiwei Hu, Liqi Zhu, Qian Yang
Intestinal epithelial cells are the targets for transmissible gastroenteritis virus (TGEV) infection. It is urgently to develop a novel candidate against TGEV entry. Bacillus subtilis is a probiotics with excellent anti-microorganism properties, and one of its secretions, surfactin, has been regarded as the versatile weapons for most plant pathogens, especially for the enveloped virus. We demonstrate for the first time that Bacillus subtilis OKB105 and its surfactin can effectively inhibit one animal coronavirus, TGEV, entering the intestinal porcine epithelial cell line (IPEC-J2)...
March 7, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28254280/effects-of-alkyl-polyglycoside-apg-on-bombyx-mori-silk-degumming-and-the-mechanical-properties-of-silk-fibroin-fibre
#19
Fei Wang, Yu-Qing Zhang
Alkyl polyglycoside (APG), a nonionic surfactant, is often considered to be a green surfactant and is synthesized using glucose and long chain fatty alcohols. It is used as a degumming agent of Bombyx mori silk fibre in this study for the first time. We studied APG systematically in comparison to the traditional degumming methods, such as aqueous solutions of sodium carbonate (Na2CO3) and neutral soap (NS). After repeatedly boiling silk fibres in an aqueous solution of 0.25% APG three times for 30min and using a bath ratio of 1:90-120 (g/mL), sericin was completely removed from the fibre...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28245017/encapsulation-of-enzymes-in-metal-ion-surfactant-nanocomposites-for-catalysis-in-highly-polar-solvents
#20
Xun Cao, Yan Ni, Alei Zhang, Sheng Xu, Kequan Chen, Pingkai Ouyang
We described a method to encapsulate enzymes in metal ion-surfactant nanocomposites. The nanobiocatalyst displayed highly retained activity (∼100%) and much improved stability in protein-denaturing organic solvents. As a demonstration, the encapsulated lipase exhibited much higher activity and stability in the synthesis of vitamin E succinate in dimethyl sulfoxide.
March 9, 2017: Chemical Communications: Chem Comm
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